Seljalandsfoss waterfall, Iceland. Seljalandsfoss is one of the most popular waterfalls and natural wonders in Iceland. The waterfall drops 60 meters and is part of the Seljalands River that has its origin in the volcano glacier Eyjafjallajökull. One of the interesting things about this waterfall is that visitors can walk behind it into a small cave. Photo by liam_tansey via Instagram #amitrips #travel #waterfall #iceland